JPS63292797A - Multiplex system for digital still picture - Google Patents

Abstract

PURPOSE:To clearly identify a monochromatic graphic still picture in a color still picture even when there is no brightness color difference by switching and displaying the reproduced picture of a monitor device to either one of the color still picture, a background color picture and the monochromatic graphic still picture for a picture element unit. CONSTITUTION:In a display picture element position, when the monochromatic graphic still picture 1 is in the range of the first brightest brightness of color level, its monochromatic graphic still picture signal is displayed, when it is in the range of a third darkest brightness of color level, the color still picture 1 or the background color pictures 3, 4 are displayed. Accordingly, at the time of superimposing the monochromatic graphic still picture such as a character on the color still picture, the brightness of color level of the digital brightness picture element data of the picture element corresponding to a boundary part of the color still picture and the monochromatic graphic still picture is set to a value within the range of a third brightness of color level and the background color picture can be interposed in the boundary part.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a multiplexing method for digital still images, and in particular to a first digital still image based on a group of pixel data regarding a high-definition color still image, and a first digital still image based on a group of pixel data regarding a high-definition color still image, and a graphic multiplexing method regarding a monochromatic still image. The present invention relates to a multiplexing method for multiplexing and displaying a second digital still image based on a data group.

Conventional technology Current color television system (NTSC system, etc.)
So-called high-definition television systems (hereinafter also referred to as high-vision systems), which are capable of transmitting images with much higher definition and quality, have been actively researched. This high-definition television signal (high-definition signal) has, for example, 1125 scanning lines and a field frequency of 60H.
z, the luminance signal band is 20M)-1z, and two types of color signals are transmitted: a wideband color signal with a band of 7.0 MHz and a narrow band color signal with a band of 5.5 MHz. There are several prototypes for recording this high-definition signal, which is an analog signal, on a video disc.For example, the present applicant previously proposed in Japanese Patent Application No. 60-281615 that the header signal that defines the playback conditions is a group of pixel data. A digital video signal recording and reproducing method and a reproducing apparatus for recording and reproducing digital video signals have been proposed.

According to the recording/playback method and playback device proposed by the present applicant, high-definition color still images and partial moving images can be recorded and played back together with information signals such as audio signals, and high-definition image signals can also be recorded and played back. Because recording and playback is performed without band compression, the recording and playback system can be configured at low cost, and furthermore, monochrome figures (for convenience, in this specification, ``figure'' refers to letters 9 figures, symbols, or combinations thereof) Since the high-definition image signal related to It is possible to reproduce a figure image of a single hue in a shorter time than a high-definition image. Therefore, when performing a predetermined cue reproduction of a high-definition color image signal using random access, for example, the above-mentioned By recording pixel data related to figures, it is possible to shorten the non-display period from the cue point until the high-definition image is displayed, and furthermore, the color high-definition image is displayed from the cue point. It is possible to display graphic images in high definition until the image is displayed, and by optionally inserting and recording pixel data related to the above-mentioned graphics into the color high-definition pixel data, it is possible to reproduce a rich variety of images. It has many features such as the ability to

Problems to be Solved by the Invention However, in the recording and reproducing method and reproducing apparatus proposed by the applicant, a graphic still image of a single hue is superimposed within a high-definition color still image (natural image). When obtaining a paused playback image, since both still images were switched and combined, the brightness and hue of the color still image may be close to or close to the brightness and hue of the graphic still image, respectively. However, there were problems in that it was difficult to distinguish between the two, and it was difficult to distinguish graphic still images.

The present invention was created in view of the above points, and an object of the present invention is to provide a digital still image multiplexing system that allows two still images to be distinguished even without a difference in brightness.

Means for Solving the Problems The digital still image multiplexing method of the present invention provides a first component encoded signal of a first luminance pixel data group and two types of color pixel data groups regarding a color still image, and a monochromatic A second component encoded signal of a second luminance pixel data group related to a graphic still image, a third luminance pixel data group related to a background color image, and two types of color pixel data groups are respectively time-division multiplexed and transmitted. A digital still image multiplexing method for obtaining a reproduced image in which the monochrome graphic still image is embedded in the color still image or the #1 scenery image using a decoder for these pixel data groups, wherein the second luminance The brightness level of the monochromatic graphic still image based on the pixel data group is divided into a first to third brightness level range, and according to these,
The reproduced image to be displayed is defined among the color still image, monochrome graphic still image, and blue stone image.

The reproduced images obtained by the decoder are of three types: a color still image, a monochrome graphic still image, and a background color image,
These are selectively read out from the memory in the decoder and output, but what is finally displayed as a reproduced image is that the brightness of the pixel of the monochrome graphic still image corresponding to the pixel position is determined by where it falls within the brightness level range.

That is, when the monochrome graphic still image is within the brightest first brightness level range of the first to third brightness level ranges at the display pixel position, the monochrome graphic still image signal is displayed. , within the third darkest brightness level range, the background color image is displayed. Furthermore, when the brightness is within the second brightness level range of intermediate brightness, a color still image or a background color image is displayed (here, whether to display a color still image or a background color image is determined by the pixel data group described above. ).

Therefore, when superimposing a monochrome graphic still image such as text on a color still image, the brightness level of the second digital luminance pixel data of the pixel corresponding to the boundary between the color still image and the monochrome graphic still image is adjusted. By setting a value within the third brightness level range, a background color image can be interposed in the boundary portion.

Embodiment FIG. 1 shows an explanatory image of an embodiment of the system of the present invention. In Figure 1, ■ indicates the scanning direction of the scanning line of the monitor receiver,
During the scanning period, a color still image (not shown) based on the first component encoded signal reproduced from the recording medium is displayed in mm indicated by a and e, and a color still image (not shown) is displayed from the recording medium in the period indicated by cr. The character rlJ (usually a white character having only brightness) is displayed as a monochrome graphic still image based on the reproduced second luminance pixel data group. For example, as shown in FIG. 2, this character 1 is superimposed on color still image 2b of color still images 2a and 2b on the monitor screen.
This is the character rlJ among the characters .

Furthermore, according to this embodiment, in periods d and d of the boundary between character 1 and the color still image in FIG. It is displayed as an outline. This display mode applies not only to the letter 1 of rN, but also to the remaining rTJ, rMJ, r
Similarly, the outline of the character EJ is displayed.

Next, a recording system and a reproducing apparatus for a recording medium that enable the above-mentioned image display will be explained. In this embodiment, the number of scanning lines is 11.
The effective pixel data of the .25 high-definition signal constitutes a digital video signal together with a header signal and a command block, which will be described later, and is recorded on a disk and reproduced.

The pixel data and header signal in this digital video signal are combined with pixel data and recorded on a digital audio disc, as shown in FIGS. 3 and 4, respectively, similarly to the method proposed by the present applicant. . That is, the header signal 5 consists of 6 words, and one word consists of 16 bits.

Each word is divided from most significant bit (MSB) to least significant bit (
The header signal 5 is transmitted sequentially from the first word to the sixth word. As shown in FIG. 3, the header signal 5 defines the image transmission/reproduction conditions for the pixel data section (image data section) 6 of one vertical line segment or one horizontal line segment following it. The header signal 5 and pixel data section 6 have a signal format as shown in FIG.

By the way, the scanning *a of the high-definition signal is 1125 lines, of which the number of effective scanning lines is about 1024.

Also, - the number of pixels (number of sample points) of the luminance signal per scanning line
is obtained by dividing the sampling frequency by the horizontal scanning frequency fH, and is, for example, 1472. However, in addition to pixels for image information, there are also pixels for the horizontal blanking period, and horizontal and vertical synchronization signals can also be added in the playback system, and in order to save memory capacity in the playback system, , excluding pixels in the horizontal blanking period, etc., the minimum number of pixels of image information required can be 1280. Therefore, the number of 1111 degree pixel data for - the number of scanning lines is 1280,
Also, the number of first and second color pixel data is 64 each because the sampling frequency is 1/2 that of the luminance pixel data.
It is assumed to be 0 pieces.

Therefore, in this embodiment, the luminance pixel data regarding the color still image (natural image) in the digital video signal to be reproduced from the disk is 1 per frame, 1024×1.
000 pieces, with an aspect ratio of 16:9 (5,33:
3) The image (actually compressed in the horizontal direction) is recorded on the disk. Here, the horizontal scanning frequency fH is 3
At 3.75kHz (=30Hz xl125),
The sampling frequency fs of the luminance signal is 49.68 MHz (
= 1472x33.75kHz), which is 192 (
The horizontal blanking period, which is equal to the pixel data transmission period of = 1472-1280), is 3.86 us (= 192
÷49.68 MHz).

Furthermore, the broadband color signal and the narrowband color signal each have a frequency fs/
2 (here 24.84 M, which is the frequency of 736 fH)
After being sampled separately at the second sampling frequency of H2'), they are separately quantized to form first and second color pixel data groups with a quantization bit count of 8 bits.

Y in the part indicated by 7 in FIG. . ＋ Yo l ＋・・
・ is the above luminance pixel data, Cwo. , . . . are first color pixel data regarding the above-mentioned broadband color signal.

CN OOl... is the second color signal related to the above narrowband color signal.
This is color pixel data. That is, as shown in FIG. 4, luminance pixel data is arranged in the upper 8 bits of each word, first or second color pixel data is arranged in the lower 8 bits of each word, and the first or second color pixel data is arranged in the lower 8 bits of each word. Since the first and second color pixel data are arranged alternately for each word, when the pixel data section 6 following the header signal 5 relates to pixel data of a high-definition signal (color still image) for one horizontal scanning line, The pixel data section 6 is as shown in FIG.
It will be 80 words.

Note that pixel data regarding monochromatic graphic still images is also recorded on the disc reproduced in this embodiment.

This monochromatic graphic still image is a single-hue still image of one graphic character, symbol, or combination thereof, and its luminance signal has a band of 20 MHz and is sampled and quantized at the sampling frequency fS. This differs from the luminance pixel data of the high-definition signal (natural image) described above in that the number of quantization bits is 4 bits. Therefore, as for the luminance pixel data (graphic data) regarding this graphic still image, as shown by 8 in FIG. 4, four graphic data are arranged in one word. Therefore, the transmission time for this graphic data is 4 bits, which is half the luminance pixel data of a natural image, which is a color image, and the number of quantization bits is 4 bits, without transmitting color pixel data. 1/4
That's enough.

The number of one scanning line of this figure data is the number of scanning lines 11 mentioned above.
25-line method 1 uses 1280 pixels, which is the same as the above luminance pixel data.
However, since four pixels are transmitted in one word as shown at 8 in FIG. 4, the graphic data for -scanning line is 32G
It will be transmitted in (-1280/4) words. 6
Word header signals are time-division multiplexed and recorded immediately before each graphic data group of 320 words.

This figure data is 4 bits, so 16 (=2')
Although it is possible to express gradation (brightness level), in reality, in order to distinguish it from the header signal 5 and each synchronization signal in the command block, which will be described later, the use of the rFJ value is prohibited in the 16-way law. Furthermore, in order to distinguish it from the end-of-transmission signal (, E OD ) of the digital video signal, the use of the value "0" in hexadecimal notation is prohibited. Therefore, the graphic data has 14 gradations of values from "1" to rEJ in hexadecimal notation (
It is used to express the brightness level (brightness level), and the higher the value, the higher the brightness.

A component encoded signal shown at 7 in FIG. 4 regarding the color still image for one screen (one frame) or a luminance pixel data group (graphic data group) shown at 8 in FIG. 4 for the monochrome graphic still image for one screen ) is combined with a header signal that defines an image or figure, and is further recorded sequentially together with a command block, and the command block, which will be described later, includes a component encoded signal regarding the background color image.

Next, the header signal will be explained. As shown in FIGS. 3 and 4, the header signal 5 is a signal for specifying the reproduction conditions for all 6 pixel data of one horizontal scanning line segment (or one vertical line segment) immediately after the first one. A synchronization signal having the same fixed pattern as the synchronization signal in the command block is arranged in word Wa.

An identification signal is placed in the second word wb. This identification signal consists of the MSB of the second word and the next 1 bit (LS
15th counting from B. The method code of the pixel data section 4 is placed in a total of 2 bits (14th bit), and when its value is "01", it indicates that this header signal is recorded and reproduced together with the pixel data related to the high-definition image. show. Further, an outer ladder signal identification code is arranged at the 13th pit of the second word wb, and when the candy is "0", it indicates a header signal.

A total of 8 pits from the 12th bit and the 6th bit to the 0th bit (18B) of the second word wb are undefined. Further, in the 11th bit of the second word wb, a transmission method identification code is arranged to identify whether the pixel data is baseband pixel data or compressed pixel data obtained by compressing a full frame image into a half frame. Compressed pixel data consists of odd-numbered sample points on a horizontal scanning line consisting of odd-numbered field data and even-numbered sample points only of even-numbered field data, and is transmitted in half the time compared to full frame pixel data. Note that the full frame pixel data is taken in as is into the memory circuit within the playback device.

On the other hand, compressed pixel data is taken into a predetermined address of the above-mentioned mail order circuit, and pixel data that is not transmitted during reproduction is replaced by reproducing any of the transmitted pixel data around it, so-called staggered reproduction, or Alternatively, interpolation is performed using data obtained by calculation of surrounding transmission pixel data. Although the arithmetic data of compressed pixel data is accompanied by some signal deterioration, the image transmission period can be reduced to 1/2, and when a dedicated reproducing apparatus is constructed, the image memory capacity can be halved.

The 10th word counting from the LSB of the second word wb. 9th, 8th
A code is placed at each bit position to identify memory scan, start of frame (SOF), and end of frame (EOF).

In the above memory scan, the pixel data in the pixel data section 4 is transmitted in the order of pixels along the horizontal scanning lines (horizontal scanning) within the screen, or in the order of pixels along the vertical direction (vertical scanning). The write address to memory is changed accordingly.

Further, at the 7th bit position counting from the LSB of the second word wb, pixel data following this header signal is stored, image data as shown by 7 in FIG. 4, and graphic data as shown by 8 in the same figure. It specifies whether there is.

Next, an example of the signal format of the command block will be explained with reference to FIG. In the figure, the vertical direction shows the number of bits, and the horizontal direction shows the number of words, and the command block has data and codes of 16 bits per word, w1 to W1 in total.
It consists of 12 words as shown in 2. Each word is transmitted in bit order from the most significant bit (M'SB>) to the least significant bit (LSB), and the command blocks are transmitted sequentially from the first word W1 to the twelfth word W12.

In addition, in Fig. 5, CH3 and CH4 on the top are digital audio discs (for example, AHD (registered trademark)).
16 each transmitted on the third and fourth channels of
This indicates that the signal is a bit signal (the same applies to the header signal shown in FIG. 4).

A fixed pattern synchronization signal is placed in the 19th line W1 of this command block, and the - is rFFF in hexadecimal notation.
When FJ (that is, all 16 bits are "1"), two channels (in this case, the third and fourth channels as described above) of the four channels of the digital audio disk are transmitted. The value is rFFF
EJ indicates that transmission is performed using one of the four channels of transmission paths.

An identification signal (data or code) is placed in the second word w2 of the command block. That is, the second word W2
When the value of the MSB and the m2 bit of the next one bit (15th bit and 14th bit) is "01", it indicates that this command block is recorded and reproduced together with pixel data regarding a high-definition image. Furthermore, the 13th bit of the second word W2 is assigned the identification code of the command block.
When the value is "1", it indicates a command block.

Counting from the LSB of the second word W2, the 12th pit, the 1st
A total of seven pits from the 0th bit to the 7th bit, the 3rd bit, and the O-th bit are undefined, and an exchange code is placed in the 6th bit as necessary. When the value of this 6th bit is "0", it is "normal", and the value of each 11-bit read start address XA and YA located at the 0th bit to the 10th bit of the 5th and 6th words. is used as is, whereas when it is '1', it is an exchange code, and when the MSB value of address YA for graphic data is 'O', it is changed to '1', and when it is '1', it is changed to 'O'. ”, and a total of 10 bits other than the MSB of the address Y^ are used as they are.This allows the figure to continue to be displayed in the same position regardless of the image cut switching, or the image You can cut and switch only the shape without changing it.

The 5th pit and 4th bit of the second word W2 are identification codes for the image muting on and off of the first screen size and the figure muting on and off, respectively, and the 2nd pit and 1st bit are the identification codes for the second screen size, respectively. Size image mute on/off and shape mute on.

Indicates off identification code. Here, the first screen is the entire screen (full screen), and the second screen is a screen whose screen size is smaller than the full screen, and the partial image 0
This is for partial figures. The background color is displayed when the image is muted.

Further, in the 11th pit of the second word W2, a code that specifies the background color or figure color of the figure image based on monochrome image data is arranged, and a wide band color related to the background color or the color (character color) of the figure image itself is arranged. The number of clustered pits of the signal, narrowband color signal and luminance signal and the 8-bit pixel data are stored in the third word w3, as shown by CWB, CNB and VB in FIG.
and is placed in the fourth word W4. However, VB is luminance pixel data regarding the background color.

59th word W5 to 12th word W of command block
Read addresses are arranged in eight words up to 12, and in the lower 11 bits of the fifth and sixth words, read start addresses XA and YA in the X direction and Y direction of the full screen image are arranged, respectively. However, the upper 5 bits of the 59th code W5 and the 67th code W6 are the image enlargement magnification data of the full screen image, and are the upper left corner of the full screen image obtained by reading from the above readout start addresses XA and YA. (1/m) x (1/m) is enlarged and displayed to fill the screen (here, the above m
are the values of XM and YM).

Note that when XM and YM are "O", display is performed at 1x.

Furthermore, the seventh word W7 to the twelfth word W shown in FIG.
The lower 11 bits of each of the 6 words up to 12 contain the readout start address of the second screen image Xs, Ye,
Codes Xc and Ycs indicating the second screen size indicate display start addresses Xo and Y of the image on the second screen, respectively. Therefore, as shown in FIG. 6, with respect to the full-screen screen 10, the image on the second screen is the area 11 surrounded by diagonal lines.
is displayed, and the display start address Xo is displayed at the upper left corner.

Yo is the readout start address X in the image memory.
The pixel data read from a, Ye is displayed, and the size of the second screen is such that the luminance pixel data is arranged horizontally by Xc and vertically by Yc.

A command block having such a signal format is recorded on a digital audio disc at a predetermined timing without being combined with pixel data.

By the way, the above-mentioned graphic data is the above-mentioned color still image (
The 14 brightness levels represented by this graphic data are divided into three brightness level ranges in this embodiment.
Depending on which of these three brightness level ranges the graphic data falls in, a pixel from one of the two natural images, the still image, and the background color image is selected and displayed as the pixel at the corresponding pixel position of the graphic data. This is what I did.

Here, the relationship between the value (lightness level) L of the graphic data and the type of image selected and displayed at that time is summarized as shown in the following table.

Whether to display a color still image or a background color image in the intermediate brightness level range (L = 7 to 4) (when the upper 2 bits of 4-bit graphic data are "01") is determined at that time. Specified by the regenerated command block.

In addition, the brightness level range with the brightest brightness (L = 14 to 8
) (the top two pits of the figure data are “11” or “1”
0''), the monochromatic figure is displayed at a brightness level Y that satisfies the formula Y=LX16+15 and is converted into a hanging number of 8 bits.

Here, in the scanning periods a and e shown in FIG.
is set in advance to a value between "°4" and "7", the above value is set in advance to a value between "3" and "1" in scanning periods S and d, and in scanning period C. The above value is “1”
A monochromatic graphic still image signal preset to any value between 4'' and 8 is recorded and reproduced.

As a result, the character 1 is framed by the background color images 3 and 4, as shown in FIG.

Background color images 3 and 4 are single-hue images that are at least different in hue from character 1, which is a monochrome graphic still image. Even in a case where it is difficult to distinguish the character 1 from the character 1 (usually a white character), according to this embodiment, the character 1 can be clearly identified and displayed using the background color images 3 and 4.

The above-mentioned digital video signal is frequency modulated and then fed to a known cutting machine, where it is converted into a modulated light beam and then focused onto a photosensitive material on a disc-shaped recording master. By subjecting this disc-shaped recording master to a known development process and disc manufacturing process, a large number of discs (digital audio discs) can be reproduced.

Next, an embodiment of the reproducing apparatus according to the present invention for reproducing the above-mentioned disc will be described with reference to the block system diagram shown in FIG. The FM signal reproduced from the digital audio disc by known means is supplied to the FM demodulation circuit 16 through the input terminal 15 shown in FIG.
After being subjected to FMI modulation, the signal is supplied to a decoding/error correction circuit 17, where it is descrambled, decoded, and error corrected to become a reproduced digital signal. Of these, reproduced digital signals related to images are supplied to a distributor 19, a header detection circuit 20, and a command block detection circuit 21 in the high-definition decoder 18, respectively. The distributor 19 supplies the luminance pixel data of the upper 8 bits of each word of the pixel data section 6 to the first image memory 22, and the color pixel data of the lower 8 bits of each word is supplied to the second and third image memories 23. and 24 are alternately divided and supplied word by word.

Furthermore, the distributor 19 supplies 16 bits of each word of the pixel data portion 6 to the graphics memory 25. Therefore, the image memory 22
is supplied with luminance pixel data, the image memory 23 is supplied with first color pixel data, and the image memory 24 is supplied with second color pixel data. Further, the graphic data is supplied to the graphic memory 25.

The digital audio signal branched and extracted by the decoding/error correction circuit 17 is digital-to-analog converted by the DA converter 48 and then outputted to the output terminal 49 as a reproduced audio signal.

On the other hand, the header detection circuit 20 detects the header signal by detecting the fixed pattern synchronization signal of the first word (Wa in FIG. 4) of the header signal 5, and further decodes the identification code in the subsequent five words. It also obtains screen address signals and supplies these signals to the output address generator 26, whose output write address is
I to write each pixel data to the specified address of the specified memory.

That is, when the header detection circuit 20 detects the synchronization signal placed in the first word of the header signal 5 shown in FIG. 4 using a 16-bit shift register or the like, it takes in the next three words, and - Only when the value of the upper two pits of the lower wb indicating high-definition image data is "01" and the 13th pit is "0", decode and write the contents of each bit and word below. The address generator 20 is controlled, but when the data is not high-definition image data, writing to the memories 22 to 25 is prohibited, for example.

When the image data in the input reproduced digital signal is high-definition image data, the write address generator 26 outputs the write address starting from the write address according to the third and fourth words in the header signal. A squeeze is carried out.

The image memory 22 for luminance signals has a memory brain that can store only 2048×2048 pixels, the image memories 23 and 24 for color signals have memory brains that are more than half the size of the image memory 22, and the graphic memory 25 has It has a memory brain that is 1/4 or more of the size of the image memory 22 described above.

Pixel data (image data) related to high-definition color still images (natural images) are stored in the image memory 22 as luminance pixel data for one frame or less, and in the image memories 23 and 24 as much as one frame's worth of pixel data. or less first
and second color pixel data are written separately.

On the other hand, the command block detection circuit 21 detects the synchronization signal of the first word W1 in the command block shown in FIG.
Only when it is detected that the value of the 15th to 13th bits (that is, the upper 3 bits including the MSB) of word W2 is "011", the values of the remaining bits in the second word and the third to third bits are Each part of the 12 words W3 to W12 is decoded, and the read address generator 2 uses the signals generated thereby.
7 to generate a predetermined read address, and
background color generation circuit 28, muting circuits 29 to 32,
The graphic color generation circuits 33 are controlled respectively.

Like the write address generator 26, the read address generator 27 is supplied with a clock signal from the synchronization signal 1 generator (SSG) 34, and is also supplied with an output signal from the command block detection circuit 21, and based on these, generates a read address and stores it in the image memory 22.
Image memory 2 by supplying people 23 and 24
2. The three types of pixel data separately multiplied by M in 23 and 24 are read out simultaneously and in parallel, and the readout frequency of the pixel data is converted and output, so that the readout pixel data is equal to the radiance pixel data. In this case, the sampling frequency is read out at, for example, 249.68 MH2, and the first and second
In the case of color pixel data, the sampling frequency is set to 24.84.
Read with Hllz. Pixel data is read out in the order of horizontal scanning of the screen.

Furthermore, when reading pixel data from the image memories 22, 23 and 24 using the output read address of the read address generator 27, the period during which 192 luminance pixel data can be transmitted is horizontal return I! i! This is an erasing period, and no pixel data is read out. During this horizontal blanking period, reproduced pixel data is written into the image memories 22-24.

Three types of pixel data read out simultaneously and in parallel from each of the image memories 22, 23 and 24 are individually supplied to muting circuits 29, 30 and 31. The muting circuits 29, 30 and 31 detect the image muting 22 by a signal obtained by decoding the image mute code at the fifth bit or the second bit of the second word in the command block by the command block detection circuit 21.゜23
and 24 reproduction output pixel data or background color generation circuit 28
A switch operation is performed to selectively output one of the pixel data. Based on the third and fourth words in the command block signal from the command block detection circuit 21, the background color generation circuit 28 generates and outputs luminance pixel data that becomes the back edge color and two types of color pixel data. The background color is specified as FF Yu's one color when recording the second recording.

From the muting circuits 29, 30 and 31, the image data is transmitted by the command block during the color still image selection W1.
The reproduced output pixel data of columns 22, 23 and 24 are selectively output as they are and supplied to switching circuits 36, 37 and 38 individually.

On the other hand, in the figure memory 25, the reproduced Yuko pit @4
The graphic data of bits is written for one frame.

Further, the graphic data read out from the graphic memory 25 with the sampling frequency converted to the aforementioned 49.68 MH2 based on the read address from the read address generator 27 is further passed through the muting circuit 32 to the switching circuit 36 and the graphic data The signals are respectively supplied to the detection circuit 35.

The graphic data detection circuit 35 compares the graphic data from the muting circuit 32 with a reference value.
The switching circuits 36 to 38 selectively output one of the three types of data supplied to each of the switching circuits 36 to 38 depending on where the lightness level belongs within the three brightness level ranges shown on the clothing. The switching is controlled respectively.

That is, fIiL of the figure data is "14'°~"8"
When the value is within the range of When data is selectively output and the value of the figure data is within the range of "3" to "1" (when the top two pits of the figure data are "00"), the switching circuits 36, 37 and 38 selectively outputs three types of collection data regarding the background color image from the background color generation circuit 28 which has passed through the muting circuits 29, 30 and 31, and supplies them to the DA converters 39, 40 and 41 individually.

Furthermore, when the value of the graphic data is within the range of "7" to "4", the graphic data detection circuit 35 detects the muting circuit 2.
The switching circuits 36, 37 and 38 are controlled to selectively output the output pixel data 9.30 and 31, respectively.

Here, each output pixel data of the muting circuits 29, 30 and 31 is transmitted to the image memory 2 based on the command block detected by the command block detection circuit 21.
These are pixel data regarding color still images (natural images) from 2.23 and 24, or pixel data regarding a background color image from the background color generation circuit 28. Therefore, when the IL of the graphic data is in the range of "7" to "4", the pixel data regarding the color still image or background color image specified by the command block is taken out from the switching circuits 36, 37 and 38, and the pixel data is sent to the DA converter. 39° 40 and 41 separately.

The analog luminance signal taken out from the DA converter 39 is supplied to a synchronization signal addition circuit 42, where both horizontal and vertical synchronization signals from the 5SG 34 are added, and then outputted to an output terminal 45 as a reproduced luminance signal. . Also, DA converter 4
0.41 separately taken out. The second analog color signal is sent to the 5SG in the synchronization signal addition circuits 43 and 44.
Horizontal and vertical synchronizing signals from 34 are added thereto, and the signal is outputted to an output terminal 46 as a reproduced wideband chrominance signal, and is outputted to an output terminal 47 as a reproduced narrowband chrominance signal. These output signals are passed through an encoder (not shown) to become the high-definition image signal (high-definition signal).

In this way, depending on the value of the graphic data, the reproduced image of the digital device is switched and displayed as a color still image (natural image), a background color image, or a monochrome graphic still image in pixel order. Therefore, by predetermining the value of figure data according to the display image by the software producer, it is possible to superimpose a figure still image with a border on a color still image, and also to adjust the presence or absence and thickness of the border. Can be set arbitrarily.

Note that the graphic color generation circuit 33 is configured to output only two types of color pixel data of a predetermined value (for example, a value indicating the midpoint gradation of two types of reproduced color pixel data) regardless of the command block. It's okay. Furthermore, it goes without saying that the recording medium may be a magnetic tape or the like.

Furthermore, when superimposing a monochrome graphic still image such as characters with a dark brightness on a color still image with a dark brightness,
It is also possible to set the value of the graphic data so that a monochromatic figure is drawn using the background color image and a border with high brightness is drawn using the graphic data.

Effects of the Invention As described above, according to the present invention, the reproduced image on the monitor device can be changed pixel by pixel to one of a color still image (natural image), a background color image, and a monochrome figure still image, depending on the value of the figure data. Since switching display has been made possible, it is now possible to interpose at least a background color image with a hue different from that of the monochrome graphic still image at the boundary part of the monochrome graphic still image, which has the same brightness and hue as the color still image. In the above case, since the background color image can be displayed as the border of the monochrome graphic still image, it is possible to clearly identify the monochrome graphic still image among the color still images, and the capacity of the graphic data is the same as before. Since the signal for the selection ratio horn of pixel data can be generated by the output of the graphic memory of the same capacity, the circuit configuration has the advantage of being the same as the conventional one.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a display image according to an embodiment of the method of the present invention;
Fig. 2 is an explanatory diagram of 1a image of a part of the playback screen, Fig. 3 is a signal format diagram of an example of a digital video signal, and Fig. 4
The figure is a signal format diagram of an example of the header signal in Figure 3, Figure 5 is a signal format diagram of an example of a command block in a digital video signal, and Figure 6 is an explanatory diagram of an example of a display image by the command block. FIG. 7 is a block system diagram showing an embodiment of a reproducing apparatus in the method of the present invention. 1... Monochrome graphic still image (character), 3.4... Bluestone image displayed as a border, 5... Header signal, 6... Pixel data section, 7... Pixel data (image data), 8...Graphic data, 15...Reproduction signal input terminal, 18...High-definition decoder, 2o...Header detection circuit, 21...Command block detection circuit, 22-24...Image Memo 1c 25...Graphic memory, 26...Write address generator, 27...Read address generator, 28...Background color generation circuit, 3
3... Graphic color generation circuit, 35... Graphic data detection circuit, 36-38... Switching circuit, 45... Reproduction luminance signal output terminal, 46.47... Reproduction color signal output terminal. Patent applicant: Purchased by Victor Japan Co., Ltd. Figure 1 Figure 2X Figure 3

Claims (2)

[Claims] (1) A first component encoded signal of a first luminance pixel data group and two types of color pixel data groups related to a color still image, a second luminance pixel data group related to a monochromatic graphic still image, and A third luminance pixel data group and a second component encoded signal of two types of color pixel data groups regarding a background color image with a hue or brightness different from that of a still image are time-division multiplexed and transmitted, and these pixels A digital still image multiplexing method for obtaining a reproduced image in which the monochrome graphic still image is embedded in the color still image or the background color image using a decoder for the data group, the method comprising: The brightness level of the monochrome graphic still image is divided into a first to third brightness level range, and when the brightness level is the brightest in the first brightness level range, the monochrome graphic still image is displayed as the reproduced image, and when the brightness level is the brightest in the first brightness level range, the monochrome graphic still image is displayed as the reproduced image, and the brightness level in the third brightness level range is the darkest. displaying the background color image as the reproduced image when the brightness level range is within the brightness level range, and displaying the color still image or the background color image as the reproduced image when the brightness level is in the second brightness level range of intermediate brightness; A digital still image multiplexing method, characterized in that a reproduced image to be displayed is defined according to the brightness level of the monochrome graphic still image. (2) The brightness level of the monochrome graphic still image is the same as the first brightness level.
and the second brightness level range, the brightness level of the second brightness pixel data at the pixel position corresponding to the changed part is set to a value within the third brightness level range. The digital still image multiplexing method according to claim 1, wherein the digital still image multiplexing method is set to .